Read backlight for x230 / x330 taobao FHD mod

read-backlight.py

#!/usr/bin/env python
import sys
import array
import usb.core
import usb.util
import os

path = "/tmp/backlight-value"

# decimal vendor and product values
dev = usb.core.find(idVendor=0x10c4, idProduct=0x83ce)

cfg = dev.get_active_configuration()
intf = cfg[(0,0)]
interface = 0

read_ep = usb.util.find_descriptor(
    intf,
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_IN)

assert read_ep is not None

if dev.is_kernel_driver_active(interface) is True:
  dev.detach_kernel_driver(interface)
  usb.util.claim_interface(dev, interface)


while 1:
  try:
      data = dev.read(read_ep.bEndpointAddress,read_ep.wMaxPacketSize)
      tmp = open(path, "w")
      tmp.write("%d\r\n" % data[-1])
      tmp.close()
  except usb.core.USBError as e:
      data = None
      if e.args == ('Operation timed out',):
          continue

usb.util.release_interface(dev, interface)
dev.attach_kernel_driver(interface)